UE Full Duplex Characteristics Reporting and Communication
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Solution Overview
Problem
Current wireless communication networks, particularly those employing Time Division Duplexing (TDD) between base stations and user equipment (UE), face limitations in latency, spectrum efficiency, and resource utilization due to their half-duplex nature, which restricts simultaneous downlink and uplink communications.
Innovation Solution
User equipment (UE) reports its duplex communication capabilities to the base station, allowing for full-duplex (FD) communication modes, including concurrent receiving and transmitting, and the base station commands the UE to operate in specific modes, such as non-overlapping or partially overlapping transmit and receive frequencies with a minimum guard band, enabling FD operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If half-duplex communication is used to separate downlink and uplink, then interference between simultaneous transmissions is avoided, but latency increases and spectrum efficiency decreases
Solution Approach 1:
The system dynamically switches between half-duplex and full-duplex communication modes based on channel conditions, traffic requirements, and interference levels. The base station can command the UE to operate in different duplex modes, allowing the system to adapt to changing conditions and optimize the trade-off between interference avoidance and latency reduction.
Solution Approach 2:
The patent changes the duplex communication parameter from fixed half-duplex to variable modes including full-duplex, non-overlapping full-duplex, and partial-overlapping full-duplex. By introducing guard bands and adjusting frequency overlap parameters, the system can control interference while enabling simultaneous transmissions to reduce latency.
2Device complexity
If half-duplex communication is used to separate downlink and uplink, then resource allocation is simplified, but spectrum efficiency decreases
Solution Approach 1:
The patent segments the frequency spectrum into different regions for downlink and uplink transmissions, with optional guard bands between them. This segmentation allows simultaneous transmissions while managing interference, thereby improving spectrum efficiency without completely complicating resource allocation.
Solution Approach 2:
The base station acts as an intermediary that coordinates full-duplex operations between the UE and the network. It commands the UE to operate in specific duplex modes and manages resource allocation, centralizing the complexity management while enabling efficient spectrum utilization through full-duplex capabilities.
3Loss of time
If full-duplex communication with overlapping frequencies is used to enable simultaneous transmissions, then latency is reduced and spectrum efficiency increases, but self-interference and cross-link interference increase
Solution Approach 1:
The patent converts the harmful self-interference into a manageable parameter by using non-overlapping frequency regions with guard bands. The guard bands act as a buffer that allows simultaneous transmissions while limiting interference to acceptable levels, effectively converting the potential harm into a controlled design parameter.
Solution Approach 2:
The system adjusts frequency allocation parameters including guard band width and frequency offset to optimize the balance between enabling simultaneous transmissions and limiting self-interference. By dynamically changing these parameters, the system can reduce latency while controlling interference levels.
4Productivity
If full-duplex communication with overlapping frequencies is used to enable simultaneous transmissions, then spectrum efficiency increases, but cross-link interference between base stations increases
Solution Approach 1:
The patent applies different frequency allocation strategies to different geographic locations and cell types. Macro cells and small cells can use different frequency offsets and guard band configurations, allowing full-duplex operations locally while managing cross-link interference between cells through coordinated frequency planning.
Data Source
AI summary
A user equipment (UE) reports, to a base station, UE duplex communication characteristics. The UE then communicates with the base station in accordance with the reported characteristics. The characteristics can include duplex communication modes supported by the UE. The modes can include receiving and transmitting concurrently with the base station; communicating in a first direction with the base station and concurrently communicating in an opposite direction with a second base station; communicating with the i in a first direction concurrent with the base station communicating in an opposite direction with another UE; and communicating in half duplex (HD) with the base station in HD. The UE can receive, from the base station, a command to communicate in a reported mode. In such cases, communicating, by the UE with the base station, in accordance with the reported duplex communication characteristics includes communicating with the base station in the commanded mode.